From: Green, Simon (Simon.Green@EU.ALTRIA.COM)
Date: Thu Dec 11 2003 - 05:33:27 EST
I can't speak for HP-UX, but AIX (4.3.3 and 5.1-04) is perfectly happy to
accept larger TZ offsets than 24. I just verified it with +/-48, but it
will also cope with quite ludicrous values.
Simon Green
Altria ITSC Europe Ltd
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> -----Original Message-----
> From: Robert Binkley [mailto:rbinkl@COMCAST.NET]
> Sent: 10 December 2003 15:18
> To: aix-l@Princeton.EDU
> Subject: Re: tomorrows date
<SNIP>
> [the TZ trick]
> If the system is located WEST of the Greenwich Meridian (ie - in the
> Americas), you can determine tomorrow's date by temporarily
> subtracting
> 24 hours from the timezone offset, like so:
>
> $ offset=`echo $TZ | tr -d '[A-Z+]'`
> $ new_offset=`echo $offset - 24 | bc`
> $ TZ=`echo $TZ | sed "s/[+-]\{0,1\}[1-9][0-9]\{0,1\}/$new_offset/` \
> date +%D
>
> Unfortunately, in this part of the world, a similar method
> method cannot
> be used to obtain yesterday's date, because, under HP-UX, the timezone
> offset can not be greater than +24.
>
> If the system is located EAST of the Greenwich Meridian (ie -
> in Europe),
> you can determine yesterday's date by temporarily adding 24
> hours to the
> timezone offset, like so:
>
> $ offset=`echo $TZ | tr -d '[A-Z+]'`
> $ new_offset=`echo $offset + 24 | bc`
> $ TZ=`echo $TZ | sed "s/[+-]\{0,1\}[1-9][0-9]\{0,1\}/$new_offset/` \
> date +%D
>
> Unfortunately, in this part of the world, a similar method
> method cannot
> be used to obtain tomorrow's date, because, under HP-UX,AIX
> the timezone
> offset cannot be less than -24.
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